Horses playground

The fence for the horses has the shape of a rectangular trapezoid with an area of 400 m2. The base lengths should be 31 m and 19 m. How many meters of boards will they need to fence if they are stacked in 5 rows?

Correct answer:

x =  430 m

Step-by-step explanation:

S=400 m2 a=31 m c=19 m n=5  S = 2a+c d  d=a+c2 S=31+192 400=16 m  b=d2+(ac)2=162+(3119)2=20 m  o=a+b+c+d=31+20+19+16=86 m  x=n o=5 86=430 m

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